const int led1=6;
const int led2=5;
const int led3=4;
const int led4=3;
const int led5=2;
const int led6=7;

void setup() {

Serial.begin(9600);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);

}

void loop() {
 
 int v = analogRead(A0);

 Serial.println(v);
 if (v==0){

   digitalWrite(led1, LOW);
   digitalWrite(led2, LOW);
   digitalWrite(led3, LOW);
   digitalWrite(led4, LOW);
   digitalWrite(led5, LOW);
   digitalWrite(led6, LOW);
 }
 else if (v<170){

   digitalWrite(led1, HIGH);
   digitalWrite(led2, LOW);
   digitalWrite(led3, LOW);
   digitalWrite(led4, LOW);
   digitalWrite(led5, LOW);
   digitalWrite(led6, LOW);
 }
 else if (v<340){
   digitalWrite(led1, HIGH);
   digitalWrite(led2, HIGH);
   digitalWrite(led3, LOW);
   digitalWrite(led4, LOW);
   digitalWrite(led5, LOW);
   digitalWrite(led6, LOW);
 }
else if (v<510){
   digitalWrite(led1, HIGH);
   digitalWrite(led2, HIGH);
   digitalWrite(led3, HIGH);
   digitalWrite(led4, LOW);
   digitalWrite(led5, LOW);
   digitalWrite(led6, LOW);
}
else if (v<780){
   digitalWrite(led1, HIGH);
   digitalWrite(led2, HIGH);
   digitalWrite(led3, HIGH);
   digitalWrite(led4, HIGH);
   digitalWrite(led5, LOW);
   digitalWrite(led6, LOW);
}
else if (v<1022){
   digitalWrite(led1, HIGH);
   digitalWrite(led2, HIGH);
   digitalWrite(led3, HIGH);
   digitalWrite(led4, HIGH);
   digitalWrite(led5, HIGH);
   digitalWrite(led6, LOW);

 }
 else {
   digitalWrite(led1, HIGH);
   digitalWrite(led2, HIGH);
   digitalWrite(led3, HIGH);
   digitalWrite(led4, HIGH);
   digitalWrite(led5, HIGH);
   digitalWrite(led6, HIGH);
 }
 delay(200);

}